This is a picture from this summer out by Mendenhall Glacier. The Arctic Terns had a nesting area there.
"The Arctic tern (Sterna paradisaea) is a small bird that makes the longest migration of any bird. It breeds in the Arctic tundra (within the Arctic Circle), but flies to the edge of the Antarctic ice pack during the winter. It flies over 21,750 miles (35,000 km) each year - roughly the circumference of the Earth. This excellent flier spends most of its life flying. This tern always experiences long days, since it spends the summer in the Arctic and the (Northern Hemisphere) winter in the Antarctic."
Taken from EnchantedLearning.com